Power shovel



Dec. 19, 1922.

E. J. ARMSTRONG.

POWER SHOVEL. HLED SEPT-20, 1921.

2 swans SHEET Dec. 19, 1922.

E. J. ARMSTRONG.

POWER $HOVEL. FILED sEPT.20. 19'21.

ZSHEETS-SHEET 2.-

m I m Patented Dec. 19, 1922.

UNITED STATES PATENT OFFICE.

EDWIN J. ARMSTRONG, OF ERIE, PENNSYLVANIA, ASSIGNOR OF ONE-HALF T0ARTHUR C. VICARY, OF ERIE, PENNSYLVANIA.

POWER SHOVEL.

Application filed September 20, 1921-. Serial No. 501,903.

To all whom. it may concern.

Be itknown that I, EDWIN J. -AI{MSTRONG,

a citizen of the'United States, residing at Erie, in the county of Erieand State of Pennsylvania, have invented new and useful Improvements inPower Shovels. of which the following is a specification. This inventionis designed to handle the slack latch line operating the latch of adipper of a power shovel. This latch line must be entirely free as thedipper is retracted in orderthat the latch may surely lock the cover.011 the other hand as the dipper is elevated and is in position to bedumped it is desirable to have this line with as little slack aspossible in order that the operator may accomplish the purpose with thegreatest convenience and this is particularly advantageous in that thepulling of the latch line ordinarily should be accomplished with onehand.

The invention is illustrated in the accompanying drawings as follows lig. 1 shows a side elevation of the power shovel with the device inplace with the dipper retracted.-

Fig. :2 shows a similar elevation with the dipper in its upper positionpreparatory to tripping the latch.

Fig. 3 a detail view of the trip lever.

Fig. TL a front elevation of the trip lever.

Fig- 5 a section through he crowding shaft and winding spool.

1 marks the frame. 2 the wheels. 3 the turn table. 1 the boom. 5 thedipper. (5 the dipper stick. 7 a rack on the dipper stick. h thecrowding gears operating on the rack T, S a shaft mnwhich the crowdinggears are mounted. and S) a gear on the shaft 8 actuated from thecrowding engine shaft 10, the shaft 10 being in the ordinary crank shaftof the crowding engine 11. The hoisting line 12 is secured to the dippercarried over the sheave 13 at the upper end of the boom and operated onthe usual drum l-l. The dipper is provided with the usual swingingbottom 15 pivotally mounted at 16. the bottom of the dipper 17 having alatch opening 18. A latch 19 is slidingly mounted in'the lugs 20 on themovable bottom and as the latch is pulled back or upwardly the bottom isreleased thus permitting the dipper to dump in the usual manner. Vhenthe dipper is retracted to the position shown in Fig. 1 the bottomswings to shut position and the latch should be free to snap into theopening 18 so as to lock the bottom in closed position. These parts are,or may be, of the usual construction.

A pull chain 21 extends from the latch to a lever 22. The lever 22 ispivoted at 23 on the dipper stick 6. A latch line 21L extends from thelever 22 around a sheave 25 to a spool 8 secured on the end of thecrowding shaft 8. The sheave 25 is mounted between the arms of aswinging lever 26 pivotally mounted on a pin 27 carried by a bracket 28.the bracket 28 being secured tothe boom 4. A guard plate 29 is arrangedaround the sheave and an eye 30 is secured to the plate 29 and the pullline 31 extends from the eye to a point in the power shovel in positionto be grasped by the operator and pulled. In the operation of the devicewhen the dipper is retracted the spool is rotated with a movement of thedipper stick through the action of the crowding engine and the latchline 24 is wound up to correspond approximately to the movement of thedipper stick. As the dipper stick is moved outwardly the spool isrotated to unwind the latch line so that the latch line may follow thedipper stick without great change in the slack. The position of thelever 2G..however. is varied slightly and its action on the latch linevaries considerably. \Vhen the dipper is retracted to the position shownin Fig. 1 the engagement of the sheave 25 with the latch line does notaffect the slack in this line to any great extent. 'hen. however. thedipper is thrust forward the latch line is carried around the sheave,the span from the spool to the sheave being approximately at rightangles to the span from the sheave to the lever The weight of the lever26. however. is not sufli cient in itself to pull the latch. It does.however, make the latch lineand pull chain taut so that the initialmovement of the latch line through the action of the pull line trips thedipper. Further the position of the lever 26 with relation to the pullline and span extending from the sheave 25 to the lever 22 is such thatapproximately the entire pulling effort on the pull line is transmittedto the latch line thus making the tripping of the latch convenient andat the in; a pull line; and means actuated by the pull line and actingon the latch line, said means increasing the slack of the latch line asthe dipper is retracted and decreasing the slack as the dipper stick isswung outwardly.

2. In a power shovel, the combination of a dipper; a swinging bottom forthe dipper; a latch for the bottom; a dipper stick; a 2 spool rotatingas the dipper stick moves;

a latch line operating on the latch and winding on the spool as thedipper stick is drawn in; a pull line; and means actuated by the pullline and acting on the latch line, said means increasing the slack ofthe latch line as the dipper is retracted and decreasing the slack asthe/dipper stick is swung outwardly, comprising a weight varying itsaction on the latch line as the dipper stick is swung. 3. Inj a powershovel, the combination of a dipper; a swinging bottom for the dipper; alatch for the bottom; a dipper stick; a

spool rotating as the dipper stick moves; a

, latch line operating on the latch and winding on the spool as thedipper stick is drawn in; a pull line; and means actuated by the pullline and acting on the latch line, said means increasing the slack ofthe latch line as the dipper is retracted and decreasing the slackas thedipper stick is swung outwardly, comprising a swinging lever with itsfree end engaging the latch line.

4. In a power shovel, the combination of a dipper; a swinging bottom forthe dipper;

a latch for the bottom; a dipper stick; a

spool rotating as the dipper stick moves;

. a latch line operating. on the latch and winding on the spool as thedipper stick is drawn in; a pull line; and means actuated by the pullline and acting on the latch line, said means increasing the slack ofthe latch line as the dipper is r tracted and decreasing the slack asthe dipper stick is swung outwardly, comprising a swinging lever with asheave at its free end engaging the latch line.

5. In a power shovel, the combination of a dipper; a swinging bottom forthe dipper; a latch for the bottom; a dipper stick; a spool rotating asthe dipper stick moves; a latch line operating on the latch and windingon the spool as the dipper stick is drawn in; a pull line; and meansactuated by the pull line and acting on the latch line, said meansincreasing the slack of the latch line as the dipper is retracted anddecreasing the slack as the dipper stick is swung outwardly, comprisinga downwardly hanging swinging lever with its free end engaging the latchline. v

6. In a power shovel, the combination of a dipper; a swinging bottom forthe dipper; a latch for the bottom; a dipper stick; a crowding shaft forthe dipper stick; a spool mounted on the crowding shaft; a latch lineoperating on the latch and winding on the and means actuated by thepull'line and acting on the latch line, said means increasing the slackof the latch line as the dipper is retracted and decreasing the slack asthe dipper stick is swung outwardly, comprising a downwardly hangingswinging lever with its free end engaging the latch line.

In testimony whereof I have hereunto set my hand.

EDIVIN 'J. ARMSTRONG.

.spool as the stick is drawn in; a pull line;

